Plaster-block composition



I06. COMPOSITIONS,

COATING OR PLASTIC.

Patented Apr. 24, 1928.

UNITED STATES PATENT OFFICE.

PLASTER-BLOGK COMPOSITION.

No Drawing. Application filed May 18,

This invention has relation to compositions for use in building walls, partitlons, ceilings and the like and is primarily designed to supplant plaster-board as now I commonly used for the purpose.

The leading object of the present invention is to provide a novel form of composition from which may be readily molded plaster-blocks of light, strong, durable and comparatively cheap construction, the texture of which blocks is relatively soft, yet tough, as distinguished from hard and brittle. A further object is to provide a plaster-block composition characterized by water proofing,

sound proofing and fire proofing qualities.

With these and other objects in view the invention consists of the improvements hereinafter described and finally claimed.

In practice the composition may be prepared in several difierent ways according to results desired and uses to which the composition is to be put.

According to one mode of procedure I take from one-half to one part of finelv divided saw-dust and mix therewith, in a dry state about one part of laster-of-Paris. To these ingredients when tfiofroughIy mixedddiiy I add about one art 0 cool water an tioroughly mix all together. From such composition blocks may be readily molded in contradistinction to compacting by hydropress or other method. A block formed of this composition is light, strong and durable; is very cheap as compared to plaster-board;

is relatively soft, yet tough and efficient for the purposes desired and may be readily cut to desired size.

In the event that the above described composition requires a binder I prefer to add to the water used about five per cent of li uid d the lue. In addition to forming a bin er plaster is being applTCFt'o'fpaiTition or the like formed of blocks made from the composition under discussion.

1923. Serial No. 639,973.

Should it be desired to harden and strengthen blocks as made from my compo sition I may add about five percent of dextrine to the composition. i

y adding to the composition about ten so per cent of silicate of soda the same is rendered waterproofing and fire proofing in quality and since a block made from my composition is sound proofing these addi tional qualities make for a very etficient and cheap plaster-block. The glue, dextrine and silicate of soda may all be used in conjunc tion or separately or any combination of them may be added to the saw-dust, plasterof-Paris and water according to the desired 60 efiect to be produced.

TVhile the above description has been re stricted to using the composition for blocks obviously the composition may be applied directly to av wall ceiling or partition in the same manner as plaster is applied.

If desired I may incorporate in my composition cork in a finely divided condition. TVhen using cork a less quantity of saw-dust is used and the proportions would then be about one-half part of saw-dust, about one half part cork to about one part of plasterof-Paris. The glue, dextrine and silicate of soda may be added, if desired, in the proportions herein before mentioned. Y5

TVhat I claim is A plaster block composition comprising approximately from a half to one part of saw dust mixed with about one part of plaster-ot-Paris, there being added about one part of water to wet the mixture. said water containin about 5% of lignid lue, about 5% ofi de xtrine, and about l-(ml silicatc of soda.

In testimony whereof I have hereunto H5 signed my name.

FREDERICK M. VENZIE. 

